You can expect a stage, a microphone and a comedian. In addition, you can also expect a lot of improvisation, jokes and different blocks than you've seen from Galder Varas on networks (in fact, if you haven't seen anything yet, I recommend you take a look before you buy a ticket, it's sure to be more helpful than this description).
And you can expect, finally, the honest intention to make you laugh out loud. But what you can't expect is a show. We've already warned you about that.